I recently left my 3s 2200 plugged into my plane over night by accident, and i found this way to help get the battery back from being fully discharged, thought id share it with you guys here so you know but also be warned the battery may not preform as well after getting it back so keep an eye on it

Connect your pack without the balance connectorSet the charger to nimh modeSet the charge current to 200mahCharge until the voltage reads at least 3.0v per cell (watch screen constantly) for example 6v for a 2cell 9v for a 3 etc Stop charger and change mode to lipoConnect the balance leadCharge as you would normally

I am new to lipos but from what I have read makes me uneasy with batteries that have been discharged, shorted and so on. I'm going to be working on the adage, better safe than watching my plane or house burn!